World oceans just had their hottest June on record: Here's why it matters

The world’s oceans just reached record-breaking surface temperatures in June 2026, setting a new record that surpasses previous highs from 2023 and 2024.

According to the European Union’s Copernicus Marine Service, the global average sea surface temperatures in June were 20.98 C, raising fresh concerns among the scientific community in the midst of scorching heatwaves and high chances of El Nino in the coming months.

The Mediterranean Sea recorded its hottest June ever at 24.3°C, with 98 percent of the basin experiencing marine heatwaves. The tropical Pacific also reached a record-breaking 27.26°C.

Similarly, the northwestern Mediterranean also reached record-shattering intensity on Monday as the temperatures soared in Europe.

According to the scientists, the onset of a potentially powerful Super El Nino will further increase global ocean and atmospheric temperatures throughout the period of 2026 and 2027.

"Current conditions could indicate the beginning of a new phase, leading, once more, to uncharted territory," said Carlo Buontempo, director of Copernicus Climate Change Service, the EU's climate monitor.

"With ocean temperatures at these levels and El Nino on the horizon, we are likely to see more temperature records fall in the coming months," Buontempo added.

Some experts emphasize that the coming of El Nino is set to deliver a temporary spike in global temperatures, but the greenhouse emissions from burning fossil fuels is responsible for the long-term warming trend globally.

According to Simon Van Gennip, lead Oceanographer for the Copernicus Marine Service, “With the arrival and the onset of an El Nino year ... we can expect that 2026 will be amongst the warmest (ever) recorded.”

Speaking about the deepening of the crisis, approximately 82 percent of the world's oceans experienced marine heatwaves during the first half of 2026.

The oceans are responsible for absorbing 90 percent of excess heat caused by anthropogenic activities, thereby bearing the brunt of regulating the Earth’s climate.

In the wake of heightened global sea temperatures, the earth will witness high atmospheric moisture along with high chances of destructive cyclones, rainfall and floods. Some regions could also experience droughts and deadly wildfires.

Prolonged heatwaves are causing coral bleaching, threatening tropical reefs and marine wildlife. It is also responsible for sea level rise, as water warms, it expands, directly contributing to rising sea levels.